Try and relax and get a good nights sleep.

Eat a good breakfast, the holiday inn they have put people in has a good one, although its not free, its worth it.

bring a sandwich, there aren't really any lunch options.

take a deep breath and be yourself, once you get past the test they want you to pass, don't give them a reason to think otherwise.

I know these seem simple, but you wouldn't believe the number of people who forget these basic things. I remember that while I was nervous in the interview, I never felt like they had it in for me.